2 Answers
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I'm not sure about the 'Virtual Terminal Access Protocol' though. That's a new one to me. Usually, if you're looking to communicate with a terminal you have to know the model of the specific terminal because there are so many different terminal specifications.

The RFC sourcebook, at the least, will give you a great resource to help implement FTP, HTTP,and RPC.

If you want to see a great example of a virtual terminal check out PuTTY

I suspect you meant the Virtual Terminal Protocol that was part of the ISO protocol stack. It was never widely deployed. The logical Internet equivalent was telnet, which, while extremely useful in its day, was insecure and has since been replaced by ssh.